Abstract: A traffic shaper which includes a cell buffer for temporarily storing an ATM cell arrived thereat, a first calculator for calculating an estimated cell sending time according to a VC contracted bandwidth, a second calculator for calculating an estimated cell sending time according to a VP contracted bandwidth, a binary tree VP sorting circuit for determining VP to be sent in top priority, a binary tree VC sorting circuit for determining VC to be sent in top priority, and a sending circuit for sending a cell in which the determined VP and VC are both brought to a transmittable state. The VP estimated sending time is revised according to the VC estimated sending time.

Abstract: A traffic shaper comprises a cell buffer for temporarily storing an ATM cell arrived thereat, a first calculator for calculating an estimated cell sending time according to a VC contracted bandwidth, a second calculator for calculating an estimated cell sending time according to a VP contracted bandwidth, a binary tree VP sorting circuit for determining VP to be sent in top priority, a binary tree VC sorting circuit for determining VC to be sent in top priority, and a sending circuit for sending a cell in which the determined VP and VC are both brought to a transmittable state. The VP estimated sending time is revised according to the VC estimated sending time.

Abstract: A target orbit of an inter-vehicle distance is calculated based on an inter-vehicle distance command value, a target orbit coincident-host vehicle running speed command value for according the inter-vehicle distance with the target orbit is calculated, and a reference host vehicle running speed command value is calculated by use of the target orbit and the target orbit coincident-host vehicle running speed command value. Moreover, a preceding vehicle acceleration is detected, and a value obtained by multiplying the preceding vehicle acceleration by a response time constant of a host vehicle running speed control system is added to the reference host vehicle running speed command value, thus a host vehicle running speed command value is calculated and set, whereby an influence of the preceding vehicle acceleration is removed, and a follow-up characteristic to an inter-vehicle distance target value is improved.

Abstract: In vehicle velocity control apparatus and method for an automotive vehicle, a first following control is allowed to be executed when a vehicle velocity of the vehicle (host vehicle) Vcar is equal to or higher than a first set vehicle velocity V1 and a second following control is allowed to be executed when the vehicle velocity of the host vehicle Vcar is equal to or lower than a second set vehicle velocity V2 which is lower than first set vehicle velocity V1 . Hence, a vehicle driver can accurately determine which of the first and second following controls is being executed by confirming the vehicle velocity of the host vehicle Vcar at which the corresponding one of the controls is started to be executed through a speedometer of the vehicle.

Abstract: In adaptive cruise control method for an automotive vehicle, an inter-vehicle distance between the vehicle and a preceding vehicle which is traveling ahead of the vehicle is detected, a velocity of at least one of the vehicle and the preceding vehicle is detected, a traveling state of the vehicle is controlled on the basis of the detected inter-vehicle distance and a target inter-vehicle distance, a delay is provided for one of the detected velocities of the vehicle and the preceding vehicle which is used to set the target inter-vehicle distance at a time of a detection of one of the velocities of the vehicle and the preceding vehicle which is used to set the target inter-vehicle distance, and the target inter-vehicle distance is set on the basis of the detected velocity of one of the vehicle and the preceding vehicle for which the delay is provided.

Abstract: An adaptive cruise control system for a host vehicle is arranged to calculate a target inter-vehicle distance between the preceding vehicle and the host vehicle, to calculate a target vehicle speed and a first target driving torque based on the inter-vehicle distance and the target inter-vehicle distance, to calculate a second target driving torque based on the target vehicle speed and the host vehicle speed, to generate a torque select signal based on the host vehicle speed, to select one of the first and second target driving torques based on the torque select signal, to match the selected target driving torque with a previous target driving torque when the target driving torque is changed, and to generate driving/braking force based on the selected target driving torque.

Abstract: A preceding vehicle following control apparatus includes a speed sensor for sensing a vehicle speed of a controlled vehicle, a spacing sensor for sensing a spacing or distance from the controlled vehicle to a preceding vehicle, and a following controller. In addition to a following mode for controlling the driving/braking force of the controlled vehicle in accordance with the spacing and the vehicle speed, the following controller has a wait mode, an auto-stop mode and a release mode. The following controller initially sets the control mode to the wait mode, and changes the control mode from the wait mode to one of the auto-stop mode and the following mode depending on whether the controlled vehicle is in a stop state or not.

Abstract: A longitudinal driving/braking force control system for controlling the vehicle speed and/or the headway vehicle-to-vehicle distance is arranged to bring a vehicle to a stop and to hold the vehicle in a stop condition with a stop holding braking force in a predetermined situation. When an accelerator pedal is depressed by a driver in the stop condition, a controller decreases the braking force from the stop holding braking force to zero according to a predetermined brake releasing characteristic to allow a start of the vehicle. In response to a driver's accelerator operation, the controller calculates a driver's input driving force, estimates a grade resistance of the vehicle and further calculates a brake actuation quantity corresponding to the grade resistance. Then, the controller modifies the brake releasing characteristic to ensure a smooth start in accordance with the calculated driver's input driving force, the estimated grade resistance and the calculated brake actuation quantity.

Abstract: A braking force control system is provided with a controller connected to a vehicle operating condition detector, an engine braking force actuator and a wheel braking force actuator. The controller determines a target total braking force on the basis of the vehicle operating condition, a target transmission ratio and a target engine output on the basis of the target total braking force and calculates an engine braking force on the basis of the vehicle operating condition. The controller extracts a fast component of a rate of change of the target total braking force and determines a target wheel braking force on the basis of the fast component. The controller controls wheel braking force actuator so as to correspond the wheel braking force to the target wheel braking force. Therefore, a total responsibility of the system is improved by enhancing a follow-up characteristic during a first half of a transient period.

Abstract: This device controls a vehicle such that a relative distance between the vehicle and a vehicle in front of it becomes a target distance. When the relative distance becomes shorter than the target distance, the device automatically operates the brake actuator to increase the relative distance, but if the driver operates the accelerator pedal while the brake actuator is operating, this device decreases the target value output to the brake actuator according to the variation rate of a throttle opening.

Abstract: In a control system for an actuator applicable to a servo system in which a low resolution sensor and/or an operation detection signal having noise components is used as a feedback signal, a low-pass filter is disposed in a feedback loop of the servo system whose cut-off frequency is varied according to an operating condition of the actuator, e.g., an operation speed of the actuator.

Abstract: A system and method for controlling an induction motor which basically achieve reductions in a steady state loss and in a transient loss of the induction motor such as a stepwise input of a torque instruction value T.sub.e *. Basically, a steady-state loss minimization magnetic flux calculating section calculates a secondary (rotor) magnetic flux .phi..sub.r * which minimizes the steady-state loss of the induction motor in response to a torque instruction value. A target magnetic flux .phi..sub.r and a differentiation of the target magnetic flux d.phi..sub.r /dt are thereafter calculated using a low pass filter transfer function such as .phi..sub.r =.phi..sub.r * 1/(1+.tau..sub..phi..S)(, wherein .tau..sub..phi. denotes a time constant, and S denotes a Laplace operator). A target torque T.sub.m is calculates using a predetermined transfer function in response to the torque instruction value such as T.sub.m =T.sub.e *.1/(1+.tau..sub.T.S)(, wherein .tau..sub.T is a time constant for the target torque).

Abstract: In a control system for an actuator applicable to a servo system in which a low resolution sensor and/or an actuator having a play in a speed-reduction gear mechanism, a control gain for the actuator is adjusted according to a result of comparison between an output signal of a control target and output signal of a controlled object. The control gain for the actuator is a cut-off frequency of a low pass filter installed in a disturbance compensator.

Abstract: A steering control system for a wheeled vehicle, comprises a steering actuator for steering the vehicle by varying one of front and rear wheel steer angles in response to a control signal representing a control steering input, a sensor for sensing a vehicle motion such as a yaw rate, and a controller for controlling the vehicle motion by producing the control signal. The controller determines an estimated vehicle motion variable from a driver's steering command and the control steering input by using one or more predetermined estimator transfer characteristics, compares the sensed and estimated vehicle motion variables to determine a deviation therebetween, and determines the control steering input so as to reduce the deviation by using a predetermined compensator transfer characteristic and a predetermined filter transfer characteristic for filtering the deviation.

Abstract: An idling speed control system is provided in an internal combustion engine which has an intake passage led to cylinders of the engine, a throttle valve installed in the intake passage, a bypass passage bypassing the throttle valve and an air-flow controller installed in the bypass passage for controlling the amount of air flowing in the bypass passage. The system comprises a first device which detects an engine torque which causes a fluctuation of rotation speed of the engine; and a second device which controls the air-flow controller in accordance with the detected engine torque.